File format for encrypted key when using using STM32Programmer_CLI -wusrkey

[js2985542]

What is the format of the file when loading an encrypted key into the FUS of WB55 via STM32Programmer_CLI? I am aware that the encrypted key is formed from using the master key, a 12-byte nonce and authenticated data of 00 00 00 02. I would think you'd need to include the 12-byte nonce in the file, but I am not seeing anything specific in ST documentation on how this file would be formatted (i.e. binary file with 12-byte nonce concatenated with encrypted key or vice-versa). Thanks!

[Bubbles]

Hi @js2985542 ,

I assume you didn't find your answer in How to use STMicroelectronics firmware upgrade services for STM32WB MCUs - Application note .

BR,

J